Scaling wise resilience is great definitely. If you compare it to stamina in an effective health type comparison similar to what tanks use though 40 res (0.42% damage reduction) compared to 60 stam gem (600hp), It only pulls ahead of stam for health after 143,000ish hps. Now keep in mind if you already have 30% damage reduction from resilience, any additional stam is 30% more useful in effective health calculations. My DKs buffed sit at 125k hp and 3k res so for them 60 stam offers about an extra 1000hp in effective health which is equivalent to 0.8% effective health.

Now obviously if you are getting heals also, res makes them more potent whereas stam does not. What I am trying to say though is that if you have a blue slot, I don't really think it is worth gemming all resilience and losing a bonus which you could potentially achieve by using a stam gem instead (after your spell pen gems obviously). Added bonus is that stam is actually slightly useful for PvE also whereas res is not.

Basically I have gemmed red for strength, yellow for res and blue for spell pen to 125 then stam. I have enchanted for hit, then reforged all hit over 5% to mastery and all available crit to mastery for my frost build.